The authors queried 313 paraprofessionals working in 77 elementary, middle, and high schools about (a) the contexts within which they support students with disabilities, (b) their knowledge about core competencies in educating these students, (c) the job-related tasks they perform most frequently, (d) their perceived ability to perform these tasks effectively, and (e) their need for further training across these knowledge and task areas. The authors found that paraprofessionals worked with a broad range of students in multiple types of classrooms within varied instructional contexts. Although most reported moderate levels of understanding across core knowledge standards, paraprofessionals articulated additional training needs in each area. In light of recent initiatives focused on increasing the quality of the special education workforce, recommendations for future research and improved practice in this area are provided. (Contains 4 tables.)